[WJEC ONLY] Confused about mathematics

There are three tiers with varying difficulty, Higher, Intermediate & Foundation. I did the second one. Is there a difference in the max/lowest grade possible for these tiers? I can't find anything online, thanks.

From the specification, here:

"There are 3 tiers of entry for this qualification.
Higher Tier: Grades A* – C
Intermediate Tier: Grades B – E
Foundation Tier: Grades D – G"

That means I got the highest grade I could ! Thank you !!